My Math Forum Probability, help me, please, So confusing

 Probability and Statistics Basic Probability and Statistics Math Forum

 March 29th, 2011, 04:46 PM #1 Senior Member   Joined: Mar 2011 Posts: 105 Thanks: 0 Probability, help me, please, So confusing The problem is Find the probability when have at least 2 heads in 3 tosses of a coin I can solve it by the list. But is's too slow if I have a big number Like, The probability when have at least 3 heads in 5 tosses Somebody solve it, by use combination like 5C3/(1/2)^5 But I'm so confused, the we use conbination if the position of heads and tails are not important. But here, the position is important. Why everybody solve it by using the combination
 March 29th, 2011, 04:53 PM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs Re: Probability, help me, please, So confusing See this topic for my "explanation" of the use of combinations for this type of problem: http://www.mymathforum.com/viewtopic.php?f=24&t=19861

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